I know how signtool work, but whenever i search for certificate I get always payed certificates from Thawte, verisign and so one. I need to sign my application but i really don't care a lot about the certificate owner, just something to prove that I am the owner of my software and my app do not throw the dialog box about unknown publisher with windows programs. Do someone here knows how to sign apps for free ? is there any certificate that anyone can use to sign its program appart from the paid ones ?